US Post Office is located at 641 Boulevard, Kenilworth, NJ. This business specializes in Post Offices. US Post Office is open Mon, 9am-5pm; Tue, 9am-5pm; Wed, 9am-5pm; Thu, 9am-5pm; Fri, 9am-5pm; Sat, 9am-1pm; Sun, Closed and accepts American Express, Discover, Mastercard and Visa.